query regarding seven segment display

hi mr arun
i need help in my problem,i have connected a thermocouple through amplification circuits and then the voltage is input to adc0804 ,i need a code to display the variouse temperature measurements that reads by adc0804 throgh 8051 on 4 digits 7 segments display(one piece)
i hope the replay thanks.

Hello friend,

Pl. check my previous posts in this thread (page 4) i have already given the full codes with comments, they are for single 7 seg LED display but you can modify for 4 digit display.

you may have to use a look up table for displaying conversion results.



Arun

Hi,

I have 5 common cathode 7segments and want to connect to 8051. I am wondering what is the best way(use as less components and ports as I can) to do so. Can you show me a brief diagram? There is many common anode circuit with 8051, but no common cathode. Using common cathode is really a bad idea for 8051??

thanks.

common cathode is not a bad idea but you need a driver in between your display and controller as in CC segments you need control the sourcing current whereas incase of CA displays you are controlling the sinking current, which is much easy to do than CC.

you can make use of darlington array like ULN2803 to drive your display.